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Proceedings Paper

Coherent Pound-Drever-Hall technique for high resolution fiber optic strain sensor at very low light power
Author(s): Mengxin Wu; Qingwen Liu; Jiageng Chen; Zuyuan He
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Paper Abstract

Pound-Drever-Hall (PDH) technique has been widely adopted for ultrahigh resolution fiber-optic sensors, but its performance degenerates seriously as the light power drops. To solve this problem, we developed a coherent PDH technique for weak optical signal detection, with which the signal-to-noise ratio (SNR) of demodulated PDH signal is dramatically improved. In the demonstrational experiments, a high resolution fiber-optic sensor using the proposed technique is realized, and n"-order strain resolution at a low light power down to -43 dBm is achieved, which is about 15 dB lower compared with classical PDH technique. The proposed coherent PDH technique has great potentials in longer distance and larger scale sensor networks.

Paper Details

Date Published: 23 April 2017
PDF: 4 pages
Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103230V (23 April 2017); doi: 10.1117/12.2265298
Show Author Affiliations
Mengxin Wu, Shanghai Jiao Tong Univ. (China)
Qingwen Liu, Shanghai Jiao Tong Univ. (China)
Jiageng Chen, Shanghai Jiao Tong Univ. (China)
Zuyuan He, Shanghai Jiao Tong Univ. (China)

Published in SPIE Proceedings Vol. 10323:
25th International Conference on Optical Fiber Sensors
Youngjoo Chung; Wei Jin; Byoungho Lee; John Canning; Kentaro Nakamura; Libo Yuan, Editor(s)

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